A U.S. Navy MH-60 Seahawk crashed shortly after takeoff on Friday while conducting routine operations in the Philippine Sea, the Navy's 7th Fleet said. It was not immediately clear how many sailors were injured, but they were in stable condition.

The Ronald Reagan Strike Group was performing routine operations off the Philippine coast around 9 a.m. when the helicopter crashed, the service said.

“All injured personnel are in stable condition under evaluation by Ronald Reagan medical staff,” the Navy said in the statement obtained by Fox News. “While some personnel will be medically evacuated ashore, none of the injuries is life-threatening.”

There were two pilots and two crew members aboard the helicopter, officials told Fox News. Their injuries ranged from minor cuts to broken bones.

Details on whether the helicopter or aircraft carrier sustained damage were not provided. The Navy said the ship remains fully mission capable and has resumed flight maneuvers.

The cause of the crash was under investigation.

This is the first known crash of a Navy helicopter in the Pacific since April last year, when a MH-60 crashed after takeoff from a destroyer near Guam.

Last year, two warships from 7th fleet were involved in separate collisions at sea killing 17 American sailors.

In August 2017, the USS John McCain collided with a merchant vessel near Singapore, killing 10 Navy sailors.

Two months earlier, seven American sailors were killed when the USS Fitzgerald struck a Philippines-flagged cargo ship off the coast of Japan.

The Associated Press contributed to this report.